You can't depend on Doublecross, since he is literally of two minds about... well, everything. Each of his beast heads has its own personality and they can't agree on anything. Make a deal or set plans with one hissing half of Doublecross and you'll likely find the other knew nothing about it and refuses to help. And don't think that getting him to transform to robot mode will help, as there's no way of knowing which mind is in control. Just about the only thing they can agree with themselves on is destroying Decepticons. Thankfully they are, at least, good at that.
His alt-mode is a Two-Headed Dragon.